Some code has appeared above the header, and I don't know how it got there, or how to remove it

Topic summary

A Shopify store owner discovered mysterious code appearing above their site header and announcement bar, visible to customers. The code snippet appears to be related to BOOMR (Boomerang) performance monitoring, with portions displayed in reversed text.

Resolution:

  • The original poster resolved the issue by uninstalling recently added apps from Shopify admin
  • The problematic code was only visible on the customer-facing site, not in the admin panel
  • Once unused apps were removed, the code disappeared

Ongoing Issue:

  • At least one other user reported experiencing the same problem
  • A Shopify representative requested additional information from affected users:
    • Store URL
    • Recent code changes to theme
    • Newly installed apps
    • Suggested troubleshooting: rolling back theme code to earlier date or previewing in fresh theme

The discussion suggests this may be a recurring issue related to third-party app installations that leave residual code in store themes.

Summarized with AI on November 9. AI used: claude-sonnet-4-5-20250929.

mine too today how to remove it please